Nerd Inverter Design Steriod Food (A Link)
http://www.wpi.edu/Pubs/E-project/Available/E-project-042711-190851/unrestricted/PWM_Techniques_final.pdf
Forum Discussion
PWM can be used to generate a lot of different waveforms, MSW being one of the simplest examples. MSW inverters use PWM to generate a regulated RMS voltage out of unregulated peaks.
